... full scale long time operation 3.overall output protect,high stability MCH Power Supply, Regulated Power Supply, 0-30V/0-3A,model MCH-303ASpecificaitons: Voltage ... VariableCurrent, Load Stability≤0.2%+3mARipple & Noise≤3mArmsWorking ConditionLine Power Supply220V±10% 50/60Hz (Alterable if needed :110± ... subject to change without prior notice. MCH-303A power supply,0-30v/0-3a power supply, single output